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  E-mail Message: I thought you might be interested in this item at http://www.worldcat.org/oclc/37907838 Title: The Usborne book of secret codes Author: Eileen O'Brien; Diana Riddell; Fiona Watt; Evans Cheryl; Mark Watkinson Publisher: Tulsa, OK : EDC Pub., 1997. ISBN/ISSN: 0746023294 9780746023297 OCLC:37907838
  

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Subjects

• Cryptography -- Juvenile literature.
• Ciphers -- Juvenile literature.
• Codes.

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The Usborne book of secret codes

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